The rapper was rushed to the UCLA Medical Center on Monday with reports suggesting he is battling extreme dehydration, sleep deprivation and paranoia.
Kim has been struggling to overcome her robbery ordeal when she was held at gunpoint in Paris in October - but has put her own feelings to one side to be her husband's 'rock'.
According to TMZ, the reality superstar, 36, has kept a 'constant vigil' by his bedside, helping to feed him.
The insider claims that Kim has found it 'excruciating' to see her husband battling severe paranoia about outsiders trying to ruin their marriage.
The source adds: 'She has been an unbelievably devoted spouse. He's a lucky man.'
She is also said to have total focus on nursing the father of her two children back to health.